Potential for hatchery broodstock conditioning of the Caribbean scallops Argopecten nucleus and Nodipecten nodosus

Velasco, Luz Adriana; Barros, Judith

doi:10.1016/j.aquaculture.2007.06.035

Cited by 18 publications

(15 citation statements)

References 20 publications

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“…() observed higher growth rates in A. purpuratus larvae and spats after thermal shock at 0°C, results that were attributed to the combined effects of selection caused by the temperature, which would eliminate weak, slow growing larvae, and lower culture densities. The significant negative correlation between culture density of A. nucleus pediveliger larvae in the settling process and post‐larvae length at the end of the period is consistent with the crowding effects at high densities previously reported for this species at post‐larvae stage (Velasco & Barros, ). This is, indeed, the most probable explanation for the differences in growth observed between the two groups, according to the hypothesis proposed by Wolff et al.…”

Section: Discussionsupporting

confidence: 90%

“…The tanks were maintained under the same general conditions described for larval rearing, but light intensity was reduced by covering tanks with a black plastic net. During the first 48 hr, temperature was kept at 20 ± 1°C to stimulate larval settling, and set to 25 ± 1°C afterwards, following the Velasco and Barros () methods. A constant level of water was maintained in all the tanks by adding seawater at the top and draining it by the bottom.…”

Section: Methodsmentioning

confidence: 99%

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Effect of three triploidy induction methods on the growth and survival of larvae and post-larvae of the Caribbean scallopArgopecten nucleus

2018

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Argopecten nucleus is a small scallop from the Caribbean Sea and a relatively new species for aquaculture. One of the key challenges to develop the farming operations for this species from the current pilot scale to commercial level is to improve its harvest size. In this study, we tested three different methods for triploidy induction. Additionally, the effect of these protocols on survival, developmental rate and size of larvae and post‐larvae were assessed. Three different mechanisms to stimulate the inhibition of the release of the second polar body were tested; (1) cold shock (18°C); (2) 6‐dimethylaminopurine (6‐DMAP); (3) cytochalasin B (CB) and (4) dimethylsulphoxide (DMSO). The treatment with 6‐DMAP yielded the highest percentage of triploid larvae (39%). The survival and development rate, however, were higher in non‐treated larvae (control) than in the treatment groups. Interestingly, larvae from CB and the DMSO control groups exhibited lower growth rates in length than those from control and the other two treatments. No influence of the triploidy induction treatments was observed on post‐larvae survival, but the size of post‐larvae was larger for the cold shock treatment and DMSO control group. Our results indicate that the use of 6‐DMAP has the greatest potential to produce triploid larvae of A. nucleus without affecting negatively growth and survival of post‐larvae.

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Section: Discussionsupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Effect of three triploidy induction methods on the growth and survival of larvae and post-larvae of the Caribbean scallopArgopecten nucleus

2018

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“…Argopecten nucleus is a functional hermaphrodite that forms sparse, low‐density populations in nature. To date, the only source of live wild individuals has been seeds obtained from artificial collectors suspended in the sea (0–19 seed m −2 collector) (Díaz & Puyana, ; Lodeiros et al, ; Valero et al, ; Velasco & Barros, ). The data registered during the controlled spawning process indicate that 0%–25% of zygotes per family began spontaneous embryonic development after the gametes release, with an average of 12%, presumably due to self‐fertilization.…”

Section: Discussionmentioning

confidence: 99%

“…Brooders were obtained as seed from artificial collectors suspended in the bay area, which were provided by the Instituto de Investigaciones Marinas y Costeras (INVEMAR, Santa Marta). Families were built as described by Barros, Velasco, et al (), Barros, Winkler, et al (), following the protocols for spawning and culture described by Velasco and Barros (, ) and Velasco et al (). Crosses were performed using a nested design, according to which the sperm of one scallop used as male (sire) was used to separately fertilize the oocytes of 2–4 individuals (dams).…”

Section: Methodsmentioning

confidence: 99%

Assessing the genetic diversity in Argopecten nucleus (Bivalvia: Pectinidae), a functional hermaphrodite species with extremely low population density and self‐fertilization: Effect of null alleles

Barros

Winkler

Velasco

2020

Ecology and Evolution

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Argopecten nucleus is a functional hermaphroditic pectinid species that exhibits self‐fertilization, whose natural populations have usually very low densities. In the present study, the genetic diversity of a wild population from Neguanje Bay, Santa Marta (Colombia), was estimated using microsatellite markers, and the effect of the presence of null alleles on this estimation was assessed. A total of 8 microsatellite markers were developed, the first described for this species, and their amplification conditions were standardized. They were used to determine the genotype of 48 wild individuals from Naguanje Bay, and 1,010 individuals derived from the offspring of 38 directed crosses. For each locus, the frequencies of the identified alleles, including null alleles, were estimated using the statistical package Micro‐Checker, and the parental genotypes were confirmed using segregation analysis. Three to 8 alleles per locus with frequencies from 0.001 to 0.632 were detected. The frequencies of null alleles ranged from 0.10 to 0.45, with Ho from 0.0 to 0.79, and He from 0.53 to 0.80. All loci were in H‐W disequilibrium. The null allele frequencies values were high, with lower estimations using segregation analysis than estimated using Micro‐Checker. The present results show high levels of population genetic diversity and indicate that null alleles were not the only cause of deviation from H‐W equilibrium in all loci, suggesting that the wild population under study presents signs of inbreeding and Wahlund effect.

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“…This in turn leads to an elevated metabolic rate and more rapid transit of food through the fish's digestive system (Goddard 1996). Velasco and Barros (2007) observed that the Caribbean scallop (Nodipecten nodosus) had a higher growth rate at 25 C than 20 or 28 C. Velasco and Barros (2007) further indicated that temperature also played various roles in the process of gonadal maturation in the scallop. Reed, Doherty, and Roseboom (1980) reported that temperature induced fast and slow mortality to fish exposed to zinc (Zn) when temperatures increase and decrease, respectively.…”

Section: Please Scroll Down For Articlementioning

confidence: 94%

Temperature effects on the toxicity of four trace metals to adult spotted Babylonia snails (Babylonia areolata)

Hajimad

Vedamanikam

2013

Toxicological & Environmental Chemistry

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A study was conducted to determine the median lethal toxicity of four heavy metals on the marine gastropod Babylonia areolata. Median lethal toxicity tests were conducted to observe the sensitivity of this gastropod to metals and how variations in temperature might affect toxicity of test elements. Four heavy metals were used in the study. It was observed that the 96-hr LC 50 (in mg/L) for the different metals was found to be nickel (Ni) 33.53 (35.at room temperature 24 C. With temperature as a variable, median lethal concentration (LC 50 ) values were observed to increase from 22.41 mg/L at 10 C to 27.34 mg/L at 28 C and reduce to 18.43 mg/L at 30 C and a further rise in toxicity was observed at 35 C where LC 50 value was 12.7 mg/L as seen in the case of Zn. It was also observed that at 40 C thermal and chemical toxicity overlapped as 100% mortality was observed in controls. This trend was noted in all metals for Babylonia areolata indicating that temperature played an important role in determining LC 50 values of toxicants.

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Potential for hatchery broodstock conditioning of the Caribbean scallops Argopecten nucleus and Nodipecten nodosus

Cited by 18 publications

References 20 publications

Effect of three triploidy induction methods on the growth and survival of larvae and post-larvae of the Caribbean scallopArgopecten nucleus

Effect of three triploidy induction methods on the growth and survival of larvae and post-larvae of the Caribbean scallopArgopecten nucleus

Assessing the genetic diversity in Argopecten nucleus (Bivalvia: Pectinidae), a functional hermaphrodite species with extremely low population density and self‐fertilization: Effect of null alleles

Temperature effects on the toxicity of four trace metals to adult spotted Babylonia snails (Babylonia areolata)

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